NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-18 T14:32:19 PDT
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For refcode 2015ApJ...799...91Y:
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2015ApJ...799...91Y On the Anisotropy of Nuclei Mid-Infrared Radiation in Nearby Active Galactic Nuclei Yang, Huan; Wang, JunXian; Liu, Teng Abstract. In the center of active galactic nuclei (AGNs), the dusty torus absorbs the radiation from the central engine and reemits in mid-infrared (MIR). Observations have detected moderate anisotropy in the dust MIR emission, in the way that type 1 AGNs (type1s) are mildly brighter in MIR comparing with type 2 sources (type2s). However, type1s and type2s were found to follow statistically the same tight MIR-hard X-ray correlation, suggesting that the MIR emission is highly isotropic assuming that the hard X-ray radiation is inclination independent. We argue that this discrepancy could be solved considering that the hard X-ray emission in AGNs is also mildly anisotropic, as we recently discovered. To verify this diagram, we compare the subarcsecond 12 micron flux densities of type1s and type2s using the [O IV] lambda25.89 micron emission line as an isotropic luminosity indicator. We find that on average type1s are brighter in nuclei 12 micron radiation by a factor of 2.6 +/- 0.6 than type2s at given [O IV] lambda25.89 micron luminosities, confirming the mild anisotropy of the nuclei 12 micron emission. We show that the anisotropy of the 12 micron emission we detected is in good agreement with radiative transfer models of clumpy tori. The fact that type1s and type2s follow the same tight MIR-hard X-ray correlation instead supports that both the MIR emission and hard X-ray emission in AGNs are mildly anisotropic. Key words: galaxies: active, galaxies: nuclei, galaxies: Seyfert, infrared: galaxies
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